Greg 95 cerebrum sponsor import

greg/management/commands/import_sponsors_from_cerebrum.py

@@ -204,9 +204,7 @@ class Command(BaseCommand):
                         )
                         cerebrum_sponsors.add(sponsor_link)
 
-            non_cerebrum_sponsors = set(current_sponsors) - cerebrum_sponsors
-
-            for non_cerebrum_sponsor in non_cerebrum_sponsors:
+            for non_cerebrum_sponsor in set(current_sponsors) - cerebrum_sponsors:
                 self._remove_sponsor_unit_link(non_cerebrum_sponsor)
 
         logger.info("import_end")